Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions).
As found with Coccinelle[1], add __counted_by for struct ib_pkey_cache. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Jason Gunthorpe <j...@ziepe.ca> Cc: Leon Romanovsky <l...@kernel.org> Cc: "Håkon Bugge" <haakon.bu...@oracle.com> Cc: Avihai Horon <avih...@nvidia.com> Cc: Anand Khoje <anand.a.kh...@oracle.com> Cc: Mark Bloch <mbl...@nvidia.com> Cc: linux-r...@vger.kernel.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- drivers/infiniband/core/cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c index 7acc0f936dad..c02a96d3572a 100644 --- a/drivers/infiniband/core/cache.c +++ b/drivers/infiniband/core/cache.c @@ -46,7 +46,7 @@ struct ib_pkey_cache { int table_len; - u16 table[]; + u16 table[] __counted_by(table_len); }; struct ib_update_work { -- 2.34.1
